A239687 - cp's OEIS frontend

A239687 Numbers n such that if n = a U b (where U denotes concatenation) then abs(sigma(a) - sigma(b)) = abs(sigma(n) - n), where sigma(n) is the sum of the anti-divisors of n.

n	a(n)
1	54
2	436
3	2014
4	2466
5	3365
6	4143
7	4965
8	7922
9	9332
10	15426
11	17554
12	24006
13	32874
14	33574
15	39476
16	44296
17	49976
18	54118
19	83726
20	116174
21	137635
22	163964
23	164824
24	177546
25	203514
26	220789
27	235434
28	379096
29	420716
30	476475
31	597741
32	600354
33	604986
34	680266
35	736306
36	748966

[54, 436, 2014, 2466, 3365, 4143, 4965, 7922, 9332, 15426, 17554, 24006, 32874, 33574, 39476, 44296, 49976, 54118, 83726, 116174, 137635, 163964, 164824, 177546, 203514, 220789, 235434, 379096, 420716, 476475, 597741, 600354, 604986, 680266, 736306, 748966]

cp's OEIS Frontend

A239687 Numbers n such that if n = a U b (where U denotes concatenation) then abs(sigma(a) - sigma(b)) = abs(sigma(n) - n), where sigma(n) is the sum of the anti-divisors of n.

Table of values

List of values

cp's OEIS Frontend

A239687 Numbers n such that if n = a U b (where U denotes concatenation) then abs(sigma*(a) - sigma*(b)) = abs(sigma*(n) - n), where sigma*(n) is the sum of the anti-divisors of n.

Table of values

List of values

A239687 Numbers n such that if n = a U b (where U denotes concatenation) then abs(sigma(a) - sigma(b)) = abs(sigma(n) - n), where sigma(n) is the sum of the anti-divisors of n.